1621568053 has 16 divisors (see below), whose sum is σ = 1977493120. Its totient is φ = 1298716416.

The previous prime is 1621568041. The next prime is 1621568059. The reversal of 1621568053 is 3508651261.

It is a cyclic number.

It is not a de Polignac number, because 1621568053 - 2¹³ = 1621559861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1621568059) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 73800 + ... + 93217.

It is an arithmetic number, because the mean of its divisors is an integer number (123593320).

Almost surely, 2^1621568053 is an apocalyptic number.

It is an amenable number.

1621568053 is a deficient number, since it is larger than the sum of its proper divisors (355925067).

1621568053 is a wasteful number, since it uses less digits than its factorization.

1621568053 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167116.

The product of its (nonzero) digits is 43200, while the sum is 37.

The square root of 1621568053 is about 40268.6981786101. The cubic root of 1621568053 is about 1174.8391034858.

The spelling of 1621568053 in words is "one billion, six hundred twenty-one million, five hundred sixty-eight thousand, fifty-three".